https://bugs.gentoo.org/981860

--- a/sources/shiboken6_generator/generator/shiboken/cppgenerator.cpp
+++ b/sources/shiboken6_generator/generator/shiboken/cppgenerator.cpp
@@ -521,6 +521,7 @@ void CppGenerator::generateIncludes(TextStream &s, const GeneratorContext &class
 
     QByteArrayList cppIncludes{"typeinfo", "iterator", // for containers
                                "cctype", "cstring",
+                               "algorithm", // std::fill
                                "type_traits"}; // enum/underlying type
     // headers
     s << "// default includes\n";